Hi jacoro1,
Congratulations on your new mattress purchase! :cheer: What latex mattress you did you order?
Take a look at the mattress protector post #89 here. There are quite a few options listed with explanations of the various types of mattress pads and protector styles. A thin polyurethane film will provide the most breathability and still be waterproof and also take as little away from the feel of your new mattress.
You’ll want to avoid plastic/PVC/vinyl backing (not breathable), and look instead for polyurethane, and a thin layer at that, in this style of product. While not as breathable as a layer of cotton, it does provide some breathability while being waterproof. Remember that water resistant is not waterproof, and a high concentration of liquid in one area can penetrate a water resistant pad quite quickly. Of course, it would depend upon the actual pad and its construction.
These would be your typical mattress protectors, and polyurethane can be both “semi-breathable” and waterproof. Whether or not it would be “too hot” for your personal preference could only be determined through your actual use.
Phoenix